[css-text] semantically-perceived letter

Author: kojiishi

css-text/Overview.bs

@@ -142,6 +142,7 @@ Terminology</h3>
 
   <p><dfn>semantically-perceived character</dfn>
   <p><dfn>visually-perceived character</dfn>
+  <p><dfn>semantically-perceived letters</dfn>
   <p><dfn>visually-perceived letters</dfn>
 
   <p id="grapheme-cluster">A <dfn>grapheme cluster</dfn> is what
@@ -270,12 +271,12 @@ Terminology</h3>
       <dt><dfn>none</dfn></dt>
         <dd>No effects.</dd>
       <dt><dfn>capitalize</dfn></dt>
-        <dd>Puts the first <i>letter</i> of each word in titlecase; other characters
+        <dd>Puts the first <i>semantically-perceived letter</i> of each word in titlecase; other characters
           are unaffected.</dd>
       <dt><dfn>uppercase</dfn></dt>
-        <dd>Puts all <i>letters</i> in uppercase.
+        <dd>Puts all <i>semantically-perceived letters</i> in uppercase.
       <dt><dfn>lowercase</dfn></dt>
-        <dd>Puts all <i>letters</i> in lowercase.</dd>
+        <dd>Puts all <i>semantically-perceived letters</i> in lowercase.</dd>
       <dt><dfn>full-width</dfn></dt>
         <dd>Puts all characters in fullwidth form.
           If the character does not have a corresponding fullwidth form,
@@ -830,14 +831,14 @@ Terminology</h3>
       <dd><i>Soft wrap opportunities</i> are as defined <a href="#line-breaking">above</a>.</dd>
       <dt><dfn>break-all</dfn></dt>
       <dd>In addition to ''word-break:normal'' <i>soft wrap opportunities</i>,
-        lines may break between any two <i>letters</i>
+        lines may break between any two <i>semantically-perceived letters</i>
         (except where forbidden by the 'line-break' property).
         Hyphenation is not applied. This option is used mostly in a context where
         the text is predominantly using CJK characters with few non-CJK excerpts
         and it is desired that the text be better distributed on each line.</dd>
       <dt><dfn>keep-all</dfn></dt>
       <dd>
-        Implicit <i>soft wrap opportunities</i> between <i>letters</i> are suppressed,
+        Implicit <i>soft wrap opportunities</i> between <i>semantically-perceived letters</i> are suppressed,
         i.e. breaks are prohibited between pairs of letters
         (including those explicitly allowed by 'line-break')
         except where opportunities exist due to dictionary-based breaking.